Recommended reading: Abbe Gluck on the many reasons that federal tax credits for insurance purchased in the Exchanges apply to both federal and state exchanges. I have posted on this issue before, and I continue to believe the challengers' arguments are specious. Professor Gluck brings a unique perspective to the argument given the empirical work she has performed (with Lisa Bressman) on federal legislative processes. Her excellent blog post on Balkinization is available here.